．I will do what I can_________ the people in trouble .

The eyes of the world are the expo in Shanghai

This book tells_____life story of John Smith, who left______school and worked for a newspaper at the age of 16.

Is Lucy knocking at the door–No. It ________ be Lucy. She is in Japan now.

I’m wondering whether the police have _____ a warning to people living in this area after several robberies.